Lithobius

Distinguished from other centipede orders by the combination of 15 adult leg pairs, simple eyes, and anamorphic development. Within Lithobiidae, species identification requires examination of subtle morphological characters including tarsal segmentation, spine patterns on legs, and genital structures. Distinguished from millipedes (Diplopoda) by having one pair of legs per body segment rather than two pairs. The genus Lithobius is broadly circumscribed and has been divided into multiple subgenera by some authors, though classification remains under discussion.

Adults have 18 body segments bearing 15 pairs of legs. Body length typically 2–5 cm, brownish in coloration. Eyes simple (ocelli) rather than compound, sometimes reduced or absent in subterranean species. Distinctive dispersed openings of coxal glands on the last pair of legs. First pair of legs modified into poison claws (forcipules) beneath the head for prey capture. Anamorphic development: juveniles hatch with fewer segments and add segments and leg pairs through successive molts until reaching the adult complement.

Found in soil, leaf litter, decaying wood, and beneath stones or bark. Common in forest floor habitats, gardens, and anthropogenically disturbed areas. Some species occupy specialized habitats including caves (troglobionts such as L. stygius and L. matulici) and high-elevation environments. In China, species recorded from larch and conifer forests at 950–1400 m elevation. Introduced populations established in urban and disturbed habitats in Colombia at 2700–2746 m elevation.

Native to the Palearctic region, particularly Europe where L. forficatus is the most abundant centipede species. Widespread across temperate Asia. Introduced to the Americas including Colombia (first records of L. forficatus and L. obscurus) and the United States (Vermont). Distribution records from Denmark, Norway, Sweden, and North America indicate broad temperate range. Individual species show more restricted distributions; L. variegatus occurs in Britain and Ireland, while L. rubriceps is restricted to Jersey in the Channel Islands.

Nocturnally active year-round in suitable conditions. Reproductive activity concentrated in spring with sperm transfer, though egg-laying extends over much of the year in some species. L. variegatus shows seasonal dietary shift, consuming more litter in winter months.

Predominantly carnivorous, feeding on insects and other small invertebrates. L. forficatus and L. variegatus have been observed to consume plant litter as well, with litter feeding occurring year-round in L. forficatus and concentrated in winter for L. variegatus. Prey captured using poison claws that inject venom to subdue victims.

Anamorphic development: juveniles hatch with fewer than 15 leg pairs and add segments and legs through successive molts until reaching adult complement of 18 segments and 15 leg pairs. Eggs deposited singly in soil. Lifespan exceeds 3 years in some species. The succession of epimorphic stadia (developmental stages) has been documented in L. variegatus.

Nocturnally active predators. Seek shelter under stones, bark, or in soil during daylight hours. Some species secrete sticky fluids to immobilize prey. Fast-moving pursuit predators using poison claws to grasp and envenomate prey. Cave-dwelling species (e.g., L. matulici) exhibit modified behaviors and reduced pigmentation; some show apparent semiaquatic tendencies in subterranean environments.

Predators of small invertebrates in soil and leaf litter communities. Contribute to nutrient cycling through consumption of decaying organic matter (documented in L. forficatus and L. variegatus). Serve as prey for larger invertebrates and small vertebrates. Important components of decomposer food webs in forest ecosystems and urban gardens.

Beneficial predators in gardens and agricultural settings, controlling pest insects. Occasionally enter human dwellings; preventable through proper mulch management and door seals. Bites painful but not dangerous to humans, comparable to bee sting intensity. Some species introduced outside native range (e.g., L. forficatus and L. obscurus in Colombia), potentially impacting local invertebrate communities. Subject of taxonomic and ecological research; L. forficatus is among the most studied centipede species.

• HessebiusGenus in the same family Lithobiidae; distinguished by specific tarsal and genital characters. H. luculentus from China similar in size and habitat preference to small Lithobius species.
• Millipedes (Diplopoda)Superficially similar elongate myriapods, but distinguished by having two pairs of legs per body segment (vs. one pair in centipedes), slower movement, and detritivorous rather than predatory habits.
• Scolopendra and other ScolopendromorphaLarger tropical centipedes with 21–23 leg pairs in adults, compound eyes, and more potent venom; distinguished from Lithobius by adult leg count and eye structure.

• centipede
• myriapod
• predator
• soil fauna
• nocturnal
• introduced species
• cave-dwelling

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Life and death down under - Garden millipedes (Order Julida) and stone centipedes (Genus Lithobius — Bug of the Week
• Pensoft Editorial Team | Blog - Part 84
• First records of Lithobius (Lithobius) forficatus (Linnaeus, 1758) and Lithobius (Lithobius) obscurus Meinert, 1872 (Lithobiomorpha, Lithobiidae) introduced to Colombia
• On the geographical distribution ofLithobius variegatusLeach, 1814, and the identity ofLithobius rubricepsNewport, 1845 (Chilopoda: Lithobiomorpha)
• THE FOOD AND REPRODUCTIVE CYCLES OF THE CENTIPEDES LITHOBIUS VARIEGATUS AND LITHOBIUS FORFICATUS IN A YORKSHIRE WOODLAND
• Figure 1 from: Dányi L, Balázs G, Tuf IH (2019) Taxonomic status and behavioural documentation of the troglobiont Lithobius matulici (Myriapoda, Chilopoda) from the Dinaric Alps: Are there semiaquatic centipedes in caves? ZooKeys 848: 1-20. https://doi.org/10.3897/zookeys.848.33084
• Disentangling the cave centipede Lithobius stygius species complex through molecular phylogenetics and redescription of L. stygius s. str.